func extract3(c chan task) []task {
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「人們只要追蹤環境中的統計資訊，就能學得非常、非常快，」雷布夏特說。「這類任務旨在模擬真實世界中的沉浸式學習情境，那裡的一切往往含糊不清，而且我們很少能立即得到回饋。」